Duro-Last X PVC Membrane

Duro-Last X PVC Membrane is a PVC roll-good membrane sold in standard lengths or custom-cut lengths, intended for low-slope commercial roofs. The 60 mil version is designated DLX60. It belongs to the Duro-Last range of PVC roof membranes.

DLX60 can be custom-cut up to 200 feet in length. Standard rolls are 100 feet long. The formulation is identical to that of the standard Duro-Last membrane, but DLX60 is made by a different process and has a smooth, matte finish, where the Duro-Last membrane is textured and glossy.

A line of custom-fabricated accessories and parapets is made for use with it. These items are made from the Duro-Last membrane and have a glossier initial appearance than DLX60.

DLX60 is PVC film laminated to both sides of a weft-inserted polyester scrim. The DLX60 film is a proprietary thermoplastic PVC formulation of resins, plasticizers, stabilizers, biocides, flame retardants and ultraviolet absorbers.

• DLX60 film above the scrim: 28 mil, nominal.
• DLX60 scrim: an 18 x 14 polyester fabric with weft insertion, with thread treated to prevent wicking.
• Total thickness: 60 mil, nominal.
• Weight: 0.36 lb per square foot.
• Color: white. Surface finish: matte.
• R-value: 0.1 R (0.1 ft2·°F·hr/Btu).

Four standard rolls are supplied, ten to a full pallet. Coverage for DLX60 assumes a 6-inch overlap and Duro-Last Poly or Cleat Plates.

• DLX60 roll Item 50853: 120 in. x 100 ft, approximately 950 ft2, 360 lb.
• DLX60 roll Item 50856: 60 in. x 100 ft, approximately 450 ft2, 180 lb.
• DLX60 roll Item 50859: 30 in. x 100 ft, approximately 200 ft2, 90 lb.
• DLX60 roll Item 50862: 10 in. x 100 ft, a stripping width, 30 lb.

Custom-cut rolls are made in increments of 12 inches, up to 200 feet. Custom-cut lengths are manufactured with a tolerance of up to plus 6 inches.

A DLX60 factory line 6 inches from one edge of the sheet marks the overlap. On DLX60, marks in the form of an X at 6-inch intervals along one edge space the fasteners, with the seam plate edge flush with the sheet edge.

White DLX60 carries Cool Roof Rating Council ID 0610-0020.

• DLX60 solar reflectance: 0.87 initial, 0.65 after three years.
• DLX60 thermal emittance: 0.89 initial and 0.89 after three years.
• DLX60 solar reflective Index: 110 initial, 79 after three years.

White DLX60 alone can obtain 1 credit in LEED-NC or LEED-EB, in Sustainable Sites, Heat Island Reduction, at an SRI of 110. The membrane is used for California Title 24, LEED and other programs that call for a highly reflective roof membrane.

DLX60 was tested to ASTM D4434, Standard Specification for Poly (Vinyl Chloride) Sheet Roofing. It is classified as a Type III, internally reinforced sheet with a fabric backing, and it meets or exceeds the Type II requirements. Paired values give the machine direction first.

• DLX60 overall thickness, ASTM D751: 0.060 in. (60 mil), nominal.
• DLX60 thickness over scrim, ASTM D7635: 0.028 in. (28 mil).
• DLX60 breaking strength, ASTM D751 grab method: 502 x 405 lbf./in. The requirement is at least 275 lbf./in.
• DLX60 elongation, ASTM D751 grab method: 31% x 21%. The requirement is at least 15%.
• DLX60 seam strength, ASTM D751 grab method: 506 lbf. The requirement is at least 303 lbf.
• DLX60 tear strength, ASTM D751 Procedure B: 81 x 166 lbf. The requirement is at least 45 lbf.
• DLX60 low temperature bend, ASTM D2136: pass at -40 °F.
• DLX60 heat aging, ASTM D3045: pass after 56 days at 176 °F.
• DLX60 accelerated aging, ASTM G155: pass at 10,000 hours total test time.
• DLX60 dimensional stability, ASTM D1204: -0.45% x -0.20%. The allowable change is 0.5% or less.
• DLX60 water absorption, ASTM D570: 2.8% after 168 hours at 158 °F. The allowable change is 3% or less.
• DLX60 static puncture, ASTM D5602, and dynamic puncture, ASTM D5635: both pass.
• DLX60 fungi resistance, ASTM G21: no sustained growth or discoloration.
• DLX60 moisture vapor transmission, ASTM E96 Procedure B, Method A: less than 0.35 U.S. perms.

Three attachment methods are given for DLX60.

• DLX60 mechanically fastened: to a range of roof deck and wall materials, with a slip sheet, insulation or cover board where required. System requirements are in the Duro-Last Roll Good Mechanically Fastened Roofing System Specification.
• DLX60 induction welded: under the Duro-Bond Induction Weld Roofing System Specification.
• DLX60 adhered: to properly prepared roof decks, walls, cover boards and insulations, under the Adhered Roofing System Specification.

DLX60 rolls are stored lengthwise on pallets and kept dry with tarps.

Codes and standards named for DLX60 are Underwriters Laboratories (US and Canada), UL Evaluation Report ER10128, FM Approvals, CCMC 13299-L, State of Florida, Miami-Dade County and Texas Department of Insurance.

Available warranties for DLX60 are, in the Supreme category, the 15-Year NDL Warranty and two 20-Year NDL Warranties (15 years consequential damages with 5 years material, or with 5 years material and labor). For DLX60, the Ultra category lists the 15-Year NDL Hail, Hail and High Wind, and High Wind warranties, plus the 20- and 25-Year NDL High Wind warranties. The Basic category lists the 15-, 20- and 25-Year NDL Warranty, and the Residential category the 15- and 20-Year Residential Material Limited Warranty. For DLX60, the Ultra, Basic and Residential options exclude consequential damage coverage. The 25-year options carry additional installation criteria.